1 /* 2 * Copyright (C) 2006 - 2008 Lemote Inc. & Institute of Computing Technology 3 * Author: Yanhua, yanh@lemote.com 4 * 5 * This file is subject to the terms and conditions of the GNU General Public 6 * License. See the file "COPYING" in the main directory of this archive 7 * for more details. 8 */ 9 #include <linux/cpufreq.h> 10 #include <linux/errno.h> 11 #include <linux/export.h> 12 13 #include <asm/mach-loongson2ef/loongson.h> 14 15 enum { 16 DC_ZERO, DC_25PT = 2, DC_37PT, DC_50PT, DC_62PT, DC_75PT, 17 DC_87PT, DC_DISABLE, DC_RESV 18 }; 19 20 struct cpufreq_frequency_table loongson2_clockmod_table[] = { 21 {0, DC_RESV, CPUFREQ_ENTRY_INVALID}, 22 {0, DC_ZERO, CPUFREQ_ENTRY_INVALID}, 23 {0, DC_25PT, 0}, 24 {0, DC_37PT, 0}, 25 {0, DC_50PT, 0}, 26 {0, DC_62PT, 0}, 27 {0, DC_75PT, 0}, 28 {0, DC_87PT, 0}, 29 {0, DC_DISABLE, 0}, 30 {0, DC_RESV, CPUFREQ_TABLE_END}, 31 }; 32 EXPORT_SYMBOL_GPL(loongson2_clockmod_table); 33 34 int loongson2_cpu_set_rate(unsigned long rate_khz) 35 { 36 struct cpufreq_frequency_table *pos; 37 int regval; 38 39 cpufreq_for_each_valid_entry(pos, loongson2_clockmod_table) 40 if (rate_khz == pos->frequency) 41 break; 42 if (rate_khz != pos->frequency) 43 return -ENOTSUPP; 44 45 regval = readl(LOONGSON_CHIPCFG); 46 regval = (regval & ~0x7) | (pos->driver_data - 1); 47 writel(regval, LOONGSON_CHIPCFG); 48 49 return 0; 50 } 51 EXPORT_SYMBOL_GPL(loongson2_cpu_set_rate); 52